/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.security.web.server.context;

import org.springframework.security.core.context.SecurityContext;
import org.springframework.util.Assert;
import org.springframework.web.server.ServerWebExchange;

import org.springframework.web.server.WebSession;
import reactor.core.publisher.Mono;

public class WebSessionServerSecurityContextRepository implements ServerSecurityContextRepository {

    public static final String DEFAULT_SPRING_SECURITY_CONTEXT_ATTR_NAME = "SPRING_SECURITY_CONTEXT";

    private String springSecurityContextAttrName = DEFAULT_SPRING_SECURITY_CONTEXT_ATTR_NAME;

    public void setSpringSecurityContextAttrName(String springSecurityContextAttrName) {
        Assert.hasText(springSecurityContextAttrName, "springSecurityContextAttrName cannot be null or empty");
        this.springSecurityContextAttrName = springSecurityContextAttrName;
    }

    public Mono<Void> save(ServerWebExchange exchange, SecurityContext context) {
        return exchange.getSession().doOnNext(session -> {
            if (context == null) {
                session.getAttributes().remove(this.springSecurityContextAttrName);
            } else {
                session.getAttributes().put(this.springSecurityContextAttrName, context);
            }
        }).flatMap(WebSession::changeSessionId);
    }

    public Mono<SecurityContext> load(ServerWebExchange exchange) {
        return exchange.getSession()
                .map(WebSession::getAttributes)
                .flatMap(attrs -> {
                    SecurityContext context = (SecurityContext) attrs.get(this.springSecurityContextAttrName);
                    return Mono.justOrEmpty(context);
                });
    }
}
